The National Transportation Safety Board found Boeing and the FAA responsible for "multiple system failures," leading to Alaska Airlines' door blowing off mid-flight last year near Portland, Oregon.

NTSB finds Boeing failures caused door plug blowout on 737 Max 9 NTSB blames Boeing's inadequate training for the mid-air door plug incident on Alaska Airlines. FAA criticized for oversight failures.

An Alaska Airlines 737 Max lost a fuselage piece mid-flight, prompting an NTSB investigation. The NTSB attributes the incident to failures in Boeing's training, guidance, and FAA oversight.